Saw-sharpening machine



c. '6. osnsmuwo. SAW SHARPENING MACHINE.

7 APPLICATION FILED DEC. 29. I917.

lNl/E/VTUR A TTO IVE) Patented Feb. 10,1920.

3 SHEETSSHEET 1 C. G. OSTERLUND. SAW SHARPENING MACHINE.

APPLICATION FILED usc.29. 1911.

Patented Feb. 10, 1920.

3 SHEETS-SHEET 2.

INVENTOR M i W A TTOR/VEY C. G. OSTERLUND.

SAW SHARPENING MACHINE.

APPLICATION FILED DEC.29. I917.

1,330,606., Patented Feb. 10,1920.

3 SHEETS-SHEET 3- Z INVENTOI BY h -v ATTOBW Y CHARLES Gr. OSTERLUIID, F lviOUN'l VERIE'GN, NEW YORK.

SAW-SHARPENING MACHINE.

neeaeoe.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application filed December 29', 1917. Serial No. 209,559. r

1 b all 1070077121? may 007106721.

Be it known that I, CHARLns G. 0STER- LUND, a citizen of the United States, residing at Mount Vernon, in the county of Westchester and State of New York, have invented a certain new and useful Improvement in Saw-Sharpening Machines, of which the following is a specification.

My invention relates to improvements in machines designed for sharpening and setting saws, being more particularly adapted for filing and setting the teeth of endless band saws.

Objects of my invention are to provide an apparatus of this nature in which the complications of existing similar machines are eliminated; which will perform its functions automatically; which may be either power driven or hand driven, at the option or convenience of he user; which will be low in cost of production, simple and portable in construction, and easy of attachment to any work bench or saw table; which will be durable and very efficient in operation, presenting the minimum of liability to dis order, and which by reason of its functional advantages will contribute toward great economy by lengthening the normal life of saws sharpened thereby.

l Vith the above and other objects in view,

I have devised the saw sharpening and setting machine a practical embodiment of which is represented in the accompanying drawing, forming a part of this specification, in which:

Figure 1 represents a view of my device in side elevation;

Fig. 2, top plan view of the same;

Fig. 3 an end view; and

F 1, an enlarged diagrammatic detail view of the saw setting mechanism.

Referring to the drawings, my machine comprises a base frame or bed 1, rising from which are supports 2 and 3 which carry a pulley shaft 4%, this pulley shaft being provided with fast and loose pulleys 5 and 6,

respectively. These pulleys are arranged to be connected to any suitable source of power (not shown). A driving" pinion 7 on the so pulley shaft 4t meshes with a driven gear 8 mounted on one end. of a drive shaft 9, this drive shaft 9 being mounted on stanchions 10 and 11 on the base 1.

The drive shaft carries on its other eX- 55 treniity bevel gear 12, which rotates in a vertical plane and meshes with a similar horizontally disposed bevel gear 13. This second bevel gear 13 is provided with a central shaft 14, the lower end of which forms a pivot turning in a bearing 15 on the base 1, and the upper ad of which is supported in a standard 16 uprising from the base.

The mechanism for imparting the operative movement to the saw filing means, which will presently be described, comprises a carriage 17 which is slidable longitudinally in guides 18 and 18 rising from a laterally shiftable frame 18 secured to the base 1 at the pivot points 19 and 20. The carriage 17 is provided near its extremities with file holdingmembers 21 and 22, these members being secured in any desired manner which will permit of their ready removal. I have shown an ordinary stock file 23 as being secured in the retaining members 21 and 22 by means of thumb screws 24 and 25. The member 22 is, further, adjustable longitudinally for the accommodation of files of different lengths, being secured to the carriage 17 by means of a bolt or other Tastening means 22, and arranged to slide, for adjustment, in a longitudinal slot 22 in the carriage 17 lleciprocation of the file carriage 17 is effected by means of a rock arm 26, the respective ends of which are pivoted at 27 to the file carriage, and at 28 to a crank arm 29, which crank arm 29 is in turn, keyedor otherwise suitably secured to the upper end of the shaft 14- of the bevel gear 13. It will thus be seen that by the mechanism so far described the motion of the driving means is transmitted through the gear 8, its shaft 9, the intermeshing bevel gears 12 and 13 and crank arm 29 and rock arm 26, to impart to the filing means the longitudinal reciprocatory motion requisite in the operation of saw filing.

In this connection, however, it is also necessary that the motion of' the file 23 should be effective in but one direction of its movement, as the filing is preferably done one-way. This entails the provision of means for shifting the file carriage in closer proximity to the saw in one direction of its movement, and l arrange for this by providing an eccentric face cam 30 on the main shaft 9, which cam 30 engages a buffer wheel 31 on the frame 18, the adjustment of the cam 30 being such that during the operative travel of the file 23 it will press the frame in a forward direction to render the file 23 effective against the saw, as will be more fully described hereinafter. To return the file carriage during its inoperative travel I provide, on the frame 18, a compensating spring 32, this spring being attached to any convenient part of the apparatus, such as the support 2. The amount of forward movement allowed the frame 18 is limited by an adjusting screw 33, regulation being necessary for the accommodation of saws of varying widths. This screw 33 has a knurled head, for convenience of rotation, and is threaded in an ear or other support 34.

In the present embodiment of my invention I have shown the saw supporting and guiding means as being adapted principally for band saws. This supporting mechanism involves a novel vise arrangement, mounted on the base 1, and comprising a fixed body portion 35 and a movable jaw portion 36. The fixed and movable vise portions 35 and 36 are provided with opposing faces 37 and 38 respectively, between which faces the saw blade 39 is guided so that the toothed edge of the saw abuts the file carriage and engages the file when this instrument is in po sition for use. The vise jaw 36 is held in position by a lag screw 40 provided with a thumb nut 40 a spring 41 interposed between the nut 4O of the screw 40 and the vice-jaw providing the resiliency necessary for properly supporting the saw 39. A smaller adjusting screw 42 is provided on the outer extremity of the vise jaw 36, for more accurate adjustment of the vise jaw with respect to the portion 35 and saw 39.

To adapt the saw holding vise for saws of different widths, I. provide means for positioning and retaining the saw blade so that the teeth thereof project just the proper distance beyond the vise, such means comprising a screw 43 of considerable length threaded in the body portion of the vise and provided with a knurled operating hand wheel 44. An offset member 45 on this screw 43 carries three longitudinal followers 45 46 and 47, these followers sliding in guide ways in the vise portion 35, the jaw 36 being cut away at 48 to accommodate the followers. As will be seen, the ends of these'followers 45", 46 and 47 abut against the back edge of the band saw, and the saw is moved outward to position by he rotation of the hand wheel 44. When the saw has been thus positioned, a thumb screw 49 is utilized to engage the upper follower 46 and lock it to retain the saw adjustment.

The mechanism for intermittently feeding the saw tooth by tooth as it is operated upon comprises a tongue piece or dog 50 pivoted to a rock arm 51, which arm 51 is trunnioned at 52 to a support mounted on the base 1. A spring arm 50 on this rock arm serves to cause the tongue piece 50 to continuously engage the teeth of the saw. I have constructed my saw feeding means so that the saw will be advanced the distance of one tooth after each operative movement of the file 23 whereby the file will engage a new tooth upon each operative movement, and I have also provided for what may be termed double-action movement of the tooth-raising means in connection with the setting mechanism to be hereinafter described, whereby the saw is advanced one tooth for each reciprocation of the file carriage, in both directions. This is accomplished as follows: Adjacent to the main drive shaft 9 I provide an auxiliary or cam shaft 52, the ends of which shaft are supported in bearing standards 53 and 54. On the shaft 9 is a pair of oppositely disposed elliptical cams 55 and 56, and coacting with these cams 55 and 56 I provide on the auxiliary shaft 52 a pair of toes 57 and 58, respectively. These toes 57 and 58 are secured b 7 means of screws 59 and 60. Upon the other extremity of the auxiliary shaft 52 is secured a similar toe 61, this toe 61 resting on the rock arm 51. It will thus be seen that rotation of the shaft 9 will cause the eccentrics 55 and 56 to alternately raise the toes 57 and 53, and hence rock the shaft 52, depressing the toe 61, thereby rocking the arm 51 on its bearing in a direction to cause the tongue piece 50 to engage a tooth of the saw and feed the saw up the distance of one tooth, the arm 51 being returned to its normal inoperative position by means of a coiled spring 62 (see Fig. 1) secured between the arm 51 and base 1, adjacent to the standard 53.

In the operation of filing the saw one of the cams, that numbered 56, is rendered inoperative 'ov loosening the screw of the toe 58 and allowing this toe 58 to more idly on the shaft By this means the saw will be fed the distance of a single tooth after each operative movement only of the file In the setting operation, howex'uf, as will be later clearly described, I employ the file carriage 17 whereby a tooth is set with each reciprocation of the carriage, in both directions, so that the saw feeding means must likewise operate to raise the saw after each movei'nent of the carriage 17. This, as stated. is done by utilizing both cams and 56 and toes 59 and 60.

The function of setting the saw teeth with my improved device is carried out through a novel and effective arran ement which will now he fullv described. This mechanism f clearly illustrate in Fig. 4 of the drawings, from which it will be seen the saw supporting vise has been omitted in order to show the parts below. This setting mechanism comrrises two separate setting memhers 63 and 64- which are attached in an y desired manner to the frame 18. Thumb screws (not shown however) which may be readily attached and removed, are preferable for this purpose. The members 63 and 6 2- are placed one on each side of the saw holding vise, the file 23 and its holding n'iembers 21 and 22 havin been previously removed. The removal of these holding members will uncover small pins, forming cams 65 and 66, secured to the reciprocatory carriage 17, the purpose of which will be set forth below.

The opposing setting members 63 and 6d are identical in construction, except for their reversal of position. and a description of one will suflice for both. Mounted on each setting member at the point 67 is an operating device for the saw tooth setting hammers, which device comprises a rotatable ratchet 68 and an operating arm 69. Pivoted to this arm 69 is a pawl 70, this pawl 70 being arranged to traverse the teeth 71 of the ratchet wheel 68. It will be seen that as the carriage 17 reciprocates, the cam 65 will move the arm 69 the nroner distance to cause the pawl 70 to engage a tooth of the ratchet and rotate the same. A coiled spring serves to return the arm to its original position when the carriage 17 starts on its return movement.

Pivoted to the setting member adjacent to the ratchet is a hammer member 73, this hammer 73 having a projecting; too or lever portion 7 1 which normally rests in the he ripheral interstices of the ratchet 68. This hammer forms, in effect, a spring pressed bell crank. a spring device 75 of considen able esiliencv enga in the toe portion 7' to normally maintain the nose 76 of the hammer in its operating position. When the ratchet 68 is actuated, as before described, the ratchet tooth engaging the ham mer toe 7% will in its rotation depress this member so that the nose 76 of the hammer will. rise from the saw tooth upon which it is to act. When the ratchet reaches a point in its rotation where the toe portion is released, which will be when the carriage 17 reaches the limit of its movement in one direction, the hammer will fall with considerable force upon the saw tooth. The hammer of the setting member 64: is shown in the drawings as just leaving the ratchet tooth, and the hammer of the member 63 is shown in its normal inoperative position. The blows of the hammers 7 3 will thus properly set the teeth of the saw in opposite directions.

In order that the machine may accommodate saws of various kinds, the teeth of which will require varying degrees of force in setting, 1 provide a flat cushioning spring 77 on each hammer, this spring being arranged, when the hammer falls, to engage an adjusting screw 7 8 to control the degr as of cushioning force exerted by the spring 77.

In the operation of setting the saw it is not expedient to have the frame 18 move forward and backward, as it. does in the sharpening operation when the carriage 17 reciprocates, but it should necessarily be retained in its forward position, and for this purpose I provide a thumb screw 7 9 thread ed in the frame 18 and bearing against the support 2, and arranged to be operated to lock the carriage in its foremost position against the force of the spring 32, the cam 30 therefore rotating idly on its shaft.

It will be seen from the above that the reciprocation of the carriage 17 will cause the alternate operation of the setting hammers 73, so that the teeth of the saw will be set in opposite directions. As will also be evident, both of the cams 55 and on the shaft 9 will be utilized in this operation, so that the saw will be fed up the distance of one tooth upon each reciprocation of the carriage 17, a new tooth thereby being presented for each hammer blow.

It is believed that the operation of my device will be clear from the above description. Once the saw is adjusted in place and the source of power to operate the machine is connected, for instance, through the moving of a belt (not shown herein) from the loose pulley 5 on to the fast pulley 6, the machine will start up and perform its function of filing the saw teeth automatically. l Vhen the filing has been completed the file 23 and its retaining member 21 and 22 are removed and the setting members 63 and 6d fastened in place, after which the machine is again started and the previously sharpened saw teeth properly set. By this means a band saw is sharpened and set very thoroughly and expeditiously.

Should it be desired to operate the machine by hand, a suitable source of power being unobtainable, I simply withdraw the pulley shaft 4- and pulleys 5 and 6 and attach an operating handle to the gear 8.

The convenient size and compactness of my machine permits of its ready removal from place to place, it being imply bolted or otherwise secured to any work bench or saw table. I desire it to be understood that changes in the configuration and arrangement of the several parts of my construc tion could be resorted to and that while the present showing; and description discloses only one specific embodiment of my inven tion, other forms and modifications are in cluded within the spirit and scope thereof, as expressed in the claims.

What I claim is:

1. In a saw sharpening and setting machine, a base, a drive shaft, a reciprocatory file carriage, actuating means for said carriage operated by said drive shaft, saw supporting and guiding means, an auxiliary shaft also driven from said drive shaft, a

rock arm controlled by said auxiliary shaft for feeding the saw tooth by tooth as the carriage is reciprocated to bring a new toot-h into engagement with the file upon each operative movement and means operated by said file carriage for setting the teeth of said saw.

2. In a saw sharpening and setting machine a base, a drive shaft, a reciprocatory file carriage, actuating means for said carriage operated by said drive shaft, saw supporting and guiding means, an auxiliary cam shaft driven from said first mentioned shaft, a rock arm operated from said auxiliary shaft, said rock arm carrying a spring pressed tongue piece arranged to engage the saw and feed the same tooth by tooth a the carriage is reciprocated to bring a new tooth into engagement with the file upon each operative movement and means operated by said file carriage for setting the teeth of said saw.

3. In a saw sharpening and setting ma chine, a base, a drive shaft, a reciprocatory file carriage, actuating means for said carriage controlled by said drive shaft, saw supporting and guiding means, an auxiliary cam shaft, cams on said drive shaft for actuating said auxiliary shaft, a rock arm trunnioned on the base and operated from said auxiliary shaft, aid rock arm carrying a spring pressed tongue piece arranged to engage and feed the saw as the carriage is reciprocated to bring a new tooth into engagement with the file upon each operative movement and means operated by said file carriage for setting the teeth of said saw.

4:. In a saw harpening and setting ma chine, a base, a drive shaft, a reciprocatory file carriage, actuating means for said carriage controlled by said drive shaft, saw supporting and guiding means, an auxiliary cam shaft, a pair of operating members on said auxiliary shaft, cam on said drive shaft arranged to coact with said operating members to actuate the cam shaft, a rock arm operated from said cam shaft carrying a member arranged to engage and feed the saw a predetermined distance during each reciprocation of the file carriage, means for rendering the saw feeding means ineffective during one reciprocatory movement of the carriage and means operated by said file carriage for setting the teeth of said saw.

5. In a saw sharpening and setting machine, a base, a drive shaft, saw supporting means mounted on said base, a frame tiltable on said base, a file carriage slidable on said frame, means operated from the drive shaft to reciprocate said carriage, means also operated from the drive shaft to rock the said frame to bring the carriage into closer proximity to the saw during one of its reciprocatory movements, means for securing the supporting frame in one of said positions, an auxiliary cam shaft operated from the drive shaft, saw tooth raising means actuated by said auxiliary shaft, and a pair of hammers actuated by said reciprocatory carriage and arranged to set the teeth of said saw.

6. A saw sharpening and setting machine comprising, in combination, a base, driving means, saw supporting means, a file carriage arranged to reciprocate laterally of said supporting means, saw tooth raising mechanism, a pair of stationary hammer supporting members removably secured on the base having tripping hammers pivoted thereon and means on said reciprocatory file carriage directly engaging and actuating one of said hammers in each direction of movement of said carriage to engage and set the saw teeth.

7. In a saw sharpening and setting machine, in combination, a base, driving means, saw supporting means, a frame tiltably mounted on said base, a file carriage slidable on said frame and arranged to reciprocate laterally of said saw supporting means, a pair of hammer supporting members attachable to said frame and tripping hammers pivoted on said supporting members under constant tension and arranged to be directly engaged and actuated by the reciprocatory carriage, said hammers being operative one in each direction of movement of the reciprocatory carriage.

8. In a saw sharpening machine, a file carriage arranged to reciprocate laterally of the saw, means for bringing the carriage into closer proximity to the saw for filing the teeth of the same upon its movement in one direction, means for securing the carriage in such position during the operation of setting the teeth of said saw, and means actuated directly by said reciprocatory file carriage for setting the teeth of said saw one upon each movement of said carriage in each direction.

9. In combination with a saw filing and setting machine having a reciprocatory file carriage and saw supporting and raising means, a pair of saw tooth setting hammers comprising ratchets, each having an arm and pawl actuated by said reciprocatory carriage, a spring pressed hammer in engagement with said ratchet arranged to be re leased to strike a blow upon a saw tooth gs the carriage approaches the limit of its movement in one direction, and adjustable means for cushioning the force of the blow imparted by said setting hammers.

10. In a saw sharpening and setting machine, a base, a drive shaft, saw supporting means mounted on said base, a frame tiltable on said base, a file carriage slidable on in each direction of its movement to set the teeth of said saw.

11. In a saw sharpening and setting machine, saw supporting means, a reciprocatory file carriage and percussive setting means directly engaged and actuated by said carriage upon each movement thereof in each direction for setting the teeth of said saw.

In testimony whereof, I have hereunto set my hand.

CHARLES G. OSTERLUND. 

